Ariane's mother is still alive. She knows it, but so does Rex Major. And if he finds her first, Ariane will give up all the shards of Excalibur to save her . . .

Ariane and Wally race to the Caribbean as they try to find Ariane's mother and the fourth shard of Excalibur before Major. As they struggle to stop Major, Ariane and Wally face desperate danger...and must make the most difficult decisions of their lives.

Cave Beneath the Sea is an exciting modern-day young-adult fantasy by award-winning author Edward Willett, perfect for anyone who thrills to stories of modern-day magic and tales of King Arthur.

Enjoy exciting adventures in Canada and above and below the water in the Caribbean in this fourth installment of the five-book Shards of Excalibur series.